Others:
1. baseball.jpg: https://commons.wikimedia.org/wiki/File:Baseball_(crop).jpg by Tage Olsin / CC BY-SA 2.0
2. blackslate.jpg: https://commons.wikimedia.org/wiki/File:Schiefertafelmitschwamm.jpg by Peng / CC BY-SA 3.0
3. bucket.jpg: https://commons.wikimedia.org/wiki/File:Balde.PNG by MarlonBSB / Public Domain
4. buffetset.jpg: https://commons.wikimedia.org/wiki/File:Lincoln_buff_set_-_1864.jpg by Detweiler, Susan G. / Public domain
5. bulb.jpg: https://commons.wikimedia.org/wiki/File:Gluehlampe_01_KMJ.jpg by KMJ / CC BY-SA 3.0
6. chair.jpg: https://commons.wikimedia.org/wiki/File:Chair_5709.jpg by Dori / CC BY-SA 3.0
7. cup.jpg: https://commons.wikimedia.org/wiki/File:A_cup_of_Tea.jpg by Shreya13jain / CC BY-SA 4.0
8. erasers.jpg: https://commons.wikimedia.org/wiki/File:Faber_Castell_Erasers.jpg by M1ss1ontomars2k4 / CC BY-SA 3.0
9. igloo.jpg: https://commons.wikimedia.org/wiki/File:Igloo.jpg by  U.S. National Oceanic and Atmospheric Administration / Public Domain
10. knife.jpg: https://commons.wikimedia.org/wiki/File:Chef%27s_knife.jpg by ProjectManhattan / CC BY-SA 3.0
11. pan.jpg: https://commons.wikimedia.org/wiki/File:Pfanne_(Gusseisen).jpg by Suricata / Public domain
12. pencil.jpg: https://commons.wikimedia.org/wiki/File:2014-01-16-Hittegods_(12009261426).jpg by Ole Palnatoke Andersen / CC BY 2.0
13. pillow.jpg: https://commons.wikimedia.org/wiki/File:Bristol_MMB_24_The_Galleries.jpg by mattbuck / CC BY-SA 3.0
14. plate.jpg: https://commons.wikimedia.org/wiki/File:Arktika-plate_hg.jpg by Hannes Grobe / CC BY-SA 3.0
15. spoons.jpg: https://commons.wikimedia.org/wiki/File:Arte_bizantina%2C_servizio_di_12_cucchiai_d%27argento%2C_650_ca._01.JPG by Sailko / CC BY-SA 3.0
16. volleyball.jpg: https://commons.wikimedia.org/wiki/File:Volleyball.jpg by Starlight~commonswiki / Public domain
17. weighingMachine.jpg: https://commons.wikimedia.org/wiki/File:Weighing_Machine_In_Market.jpg by Bhaskaranaidu / CC BY-SA 3.0