‘hand ax’ photo by Didier Descouens, under Creative Commons Attribution-Share Alike 4.0 International license. https://commons.wikimedia.org/wiki/File:Monti%C3%A8res_Biface_Commont_MHNT.jpg

‘cow heads’ by Giovanni Aldini, public domain.
https://commons.wikimedia.org/wiki/File:Experiments_with_cow_s_heads_Essai_th_orique_et_exp_rimental_sur_le_galvanisme_1804_a.jpg

‘bioreceptive concrete’ photo by Mary Mark Ockerbloom, under Creative Commons Attribution-Share Alike 4.0 International license.
https://commons.wikimedia.org/wiki/File:Bioreceptive_lightweight_concrete.jpg

‘veterans’ photo by airman 1st Class Joshua Magbanua, 86th Airlift Wing Public Affairs, public domain.
https://commons.wikimedia.org/wiki/File:Ramstein_AB_Airmen_honor_U.S._veterans_in_Belgium_171111-F-ZF730-0486.jpg

‘sensorium’ photo by Maurizio Pesce, under Creative Commons Attribution 2.0 Generic license.
https://commons.wikimedia.org/wiki/File:Razer_OSVR_Open-Source_Virtual_Reality_for_Gaming_(16863422875).jpg

Strange Tools Research Lab (STRL), Cincinnati, OH