Additional fun examples (artificial projections of expected behaviour, for the purpose of human familiarity or trust): - The "Checking for Audit Risk" progress

Additional fun examples (artificial projections of expected behaviour, for the purpose of human familiarity or trust): - The "Checking for Audit Risk" progress bar in TurboTax/etc software, which is shown while comparing about a dozen floating point values, perhaps after a division step. This takes imperceptable time, but the appearance of "doing work" projects value to humans. - Comfort Noise (very low volume pseudo white noise) played into a VOIP phone to replicate the ambient inductive noise in analog lines. This assures humans that their handset is not broken. - Engine Noise generated by some (nearly silent) electric vehicles. This has a huge safety component, so it's not frivolous at all!