Hutmacher and Kuhbander studied the psychological implications of having touched something. They found that “The question of how many of our perceptual experiences are stored in long-term memory has received considerable attention. The present study examined long-term memory for haptic [touch] experiences. . . . These results indicate that detailed, durable, long-term memory representations are stored as a natural product of haptic perception.” So touching builds memories, even when objects felt aren’t seen.
Fabian Hutmacher and Christof Kuhbander. “Long-Term Memory for Haptically Explored Objects: Fidelity, Durability, Incidental Encoding, and Cross-Modal Transfer.” Psychological Science, in press, https://doi.org/10.1177/0956797618803644